Question

explain the external mechanical barriers. ​

Answer 1

Explanation:

Mechanical Barriers

The outer layer of the skin is tough and very difficult for pathogens to penetrate. ... Mucous membranes secrete mucus, a slimy substance that traps pathogens. The membranes also have hair-like cilia. The cilia sweep mucus and pathogens toward body openings where they can be removed from the body.

Answer 2

Answer:

Mechanical Barriers

The outer layer of the skin is tough and very difficult for pathogens to penetrate. Mucous membranes secrete mucus, a slimy substance that traps pathogens. The membranes also have hair-like cilia. The cilia sweep mucus and pathogens toward body openings where they can be removed from the body.